Yuri confesses to a female novelist that she and two friends committed three murders and asks her to write their story. In high school, Yuri lived in a provincial apartment complex where she knew her classmate Satoko was sexually assaulted by her grandfather but couldn’t intervene, leading to their estrangement. Maho, a transfer student from Tokyo, became close to Yuri despite clashing with other students. One day, Yuri helped Maho fend off an attacker with a knife, resulting in Yuri stabbing the assailant. The next day, Satoko was arrested.
